/* reset box-sizing */
* { box-sizing: border-box; }

/* celé pozadí s mírným šumem */
body {
  background: #1b1b1b url('data:image/png;base64,...') repeat;
}
/*body {*/
/*  position: relative;*/
/*  background: #1b1b1b;*/
/*  overflow-x: hidden;*/
/*}*/

/*body::before {*/
/*  content: '';*/
/*  position: fixed;*/
/*  top: 0; left: 0; right: 0; bottom: 0;*/
/*  background: url('xddbg.jpg') center/cover no-repeat;*/
/*  opacity: 0.15; !* adjust for desired visibility *!*/
/*  z-index: -1;*/
/*  pointer-events: none;*/
/*}*/

/* skleněný efekt hlavního panelu */
main {
  background: rgba(24,24,24,0.75);
  backdrop-filter: blur(10px);
  transition: padding-bottom 0.3s ease;
}

/* canvas wrapper */
#canvas-wrap {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease;
  margin-bottom: 1.5rem; /* rezervuj prostor, aby neblikalo */
}
#canvas-wrap:not(.hidden) {
  opacity: 1;
  visibility: visible;
}

#puzzle-canvas {
  width: 100%;
  max-height: 80vh;
  height: auto;
  object-fit: contain;
  border-radius: 0.5rem;
}

/* timer jako pill */
#timer {
  background: rgba(31,41,55,0.85);
  display: inline-block;
  padding: .25rem .75rem;
  border-radius: .375rem;
  font-family: monospace;
  transition: opacity 0.3s ease, transform 0.3s ease;
  opacity: 0;
  visibility: hidden;
  margin-bottom: 1.5rem; /* rezervuj prostor */
}
#timer:not(.hidden) {
  opacity: 1;
  visibility: visible;
}

/* výsledky */
#results {
  transition: opacity 0.3s ease;
  opacity: 0;
  visibility: hidden;
  margin-bottom: 1.5rem; /* rezervuj prostor */
}
#results:not(.hidden) {
  opacity: 1;
  visibility: visible;
}

/* tlačítko start */
#start-btn {
  width: 100%;
  padding: .5rem;
  background: #2563eb;
  color: white;
  border-radius: .5rem;
  box-shadow: 0 4px 6px rgba(0,0,0,0.3);
  transition: transform .1s, box-shadow .1s;
}
#start-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 10px rgba(0,0,0,0.4);
}

/* podtržení nadpisu výsledků */
#results h2 {
  border-bottom: 2px solid #3b82f6;
  padding-bottom: .25em;
  margin-bottom: .5em;
}

/* Pro hladší layout při skrytí / zobrazení */
.hidden {

}

#canvas-wrap {
  position: relative;
}

#zoom-preview {
  display: flex;
  justify-content: center;
}
#zoom-preview.hidden {
  display: none;
}